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    <p>白菜</p>
    <em>em着重文字</em>
    <b>b粗体文本</b>
    <i>i斜体</i>
    <strong>strong加重语气</strong>
    <del>del删除字</del>
    <span>span元素无特殊含义</span>
    <p>这是一个段落<em>标题着重</em><b>标题加粗</b><i>正文斜体</i><strong>加重语气</strong><span>无特殊预期</span></p>
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